Add Mono download to linux test env

.github/actions/install-and-setup/action.yml

@@ -47,6 +47,17 @@ runs:
       uses: actions/setup-dotnet@v4
       with:
         dotnet-version: '6.x'
+    - name: Install Mono on Linux
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y apt-transport-https dirmngr gnupg ca-certificates
+        sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
+        echo "deb https://download.mono-project.com/repo/ubuntu stable-focal main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
+        sudo apt-get update
+        sudo apt-get install -y mono-complete
+
+      if: runner.os == 'Linux'
+      shell: 'bash'
 
     - name: Setup Python3
       uses: actions/setup-python@v5

commands/audit/scarunner.go

@@ -371,7 +371,7 @@ func buildDependencyTree(scan *results.TargetResults, params *AuditParams) (*Dep
 	}
 	treeResult, techErr := GetTechDependencyTree(params.AuditBasicParams, serverDetails, scan.Technology)
 	if techErr != nil {
-		return nil, fmt.Errorf("failed while building '%s' dependency tree:\n%w", scan.Technology, techErr)
+		return nil, fmt.Errorf("failed while building '%s' dependency tree: %w", scan.Technology, techErr)
 	}
 	if treeResult.FlatTree == nil || len(treeResult.FlatTree.Nodes) == 0 {
 		return nil, errorutils.CheckErrorf("no dependencies were found. Please try to build your project and re-run the audit command")